Velocity Fuse (hose break valve) ....

[xtal01]

Still on my forklift mast to a fixed lift project ....

I want to install a velocity fuse ( hose break valve ) right after the cylinder.

The original unit did have one but after 30 years of acid spillage, it is in rough shape.

I think the original unit was a "calibrated" Parker valve part number 19012DWS-3-9.0 (3/8" female NPT one each end).

Same problem I had earlier ... local forklift distributors don't even what to talk with me and won't sell me a valve.

I did put a posting on a forklift forum. No one offered to sell me one but I was told it costs about $200

I did a quick search and found a velocity fuse made by Hydac.

Called the company who referred me to two "local" vendors. I called and sent e-mails to both.

Neither could not give me any information on them other than price and delivery if I picked out a unit and gave them a part number.

Turns out they are relatively cheap. Depending on the body $59 or $110 with a two week delivery.

I have one question. There is a minimum operating pressure of 145 PSI .... why? Is this the pressure drop across the unit ( the minimum pressure it takes to open the valve) or ????

Can someone double check me on the unit I chose ... like I said, the distributor would offer no help of advice.

The unit I chose is a RBXB-SAE1-1/16-12-X-120L/MIN or RBXX-SAE1-1/16-12-X-120L/MIN ( the NPT option is no longer available ).

I have a maximum flow of approximately 6 GPM ... I am guessing the 9.0 in the original valve may have been the shut off flow.

Here is a link to the catalog ... page 57:

http://www.hydac-na.com/sites/hydac-na/SiteCollectionDocuments/Accessories Catalog.pdf

Also, is there any other manufacture of a velocity fuse that I should look at?

Thanks once again ...... Mike

 

[hydtools]

The 145psi is the minimum pressure to hold the check valve closed against its bias spring. Less than 145psi, the spring will open the check valve.

Ted

 

[xtal01]

Thanks again Ted!

I truly understand my limitations when I try to design something. This is why I usually depend on vendors to supply me with information on their product. It always amazes me when vendors can't give me information on what they sell.

Thanks again ..... Mike

 

[borisdavenport]

It will be really frustrating to those people who were technically skilled.
I often use google to find those data sheets. just write down the model number and search in this format
filetypedf your product details
this will show all pdf docs related to that product available on the internet. Hope this one helps. I am also a DIY and found most of the local shop owners are really dumb, they only know business not very much technical details are known to them

 

[borisdavenport]

I don't personally know any manufactures offering quality V-fuses. We are dealing with Pentalift as they are our providers of Docking lifts